Telephone system



Oct. 7, 1952 R. F. STEHLIK 2,613,278

TELEPHONE SYSTEM Filed April 25, 1947 6 Shets-Sheet 1 l/yvs/vme RUDOLP FRAME STEH lK BY Oct. 7, 1952 R. F. STEHLIK 2,613,273 V TELEPHONE SYSTEM Filed April 25, 1947 6 Sheets-Sheet 2 RON vow-1%- mavme ANK s RUDOLPH TEHLIK v a Z.

Oct. 7, 1952 R. F. STEHLIK 2,613,278

TELEPHONE SYSTEM Filed April 25, 1947 6 Sheets-Sheet 3 YVE/Y7'0E RUDOLPH FRANK STE HLJK Oct. 7, 1952 R. F. STEHLIK 2,613,278

TELEPHONE SYSTEM Filed April 25, 1947 6 Sheets-Sheet 4 flaw/woe RUDOLPH FRANK STEHLIK 061. 7, 1952 F, STEHLlK 2,613,278

TELEPHONE SYSTEM Filed April 25', 1947 6 Sheets-Sheet 5 Oct. 7, 1952 R. F. STEHLlK 2,613,278

TELEPHONE SYSTEM Filed April 25, 1947 6 Sheets-Sheet 6 ORIGINATING EXCHANGE TANDEM EXCHANGE Register I2 TERMINATING Fans/01o! EXCHANGE Rgg dzmns. Gal/i ll Su v H Line Se, 72) Line guiirrzqfic Finder Control Trqnk c E Circuit APPFT'US i 1 Called Subs.

I3) /4 F IG.8 Convener Printer Controller @PF PT PU Fig.1 Fig.2

Fig.3 Fig.4 Fig.5

//Yl/'/yrok RUDOLPH FRANK STEHLIK Patented Oct. 7, 19 52 "TELEPHONE SYSTEM Rudo1phI=F1 ankSthlik, Antwerp, Belgium, as-

:signor to: Automatic Electric Laboratories, Inc., JChicagm'i'IlL, fa, corporation of "Delaware Application April 25, 1947,: Serial No; 743,965 \lmGreatBritainJanuaryffi, 1940 'Section'LTiiblicLaw 690, August 8,1946 IPateht expires J anu'ary fi, 1960 110 (ilaims;

The present invention"cdncernsimprovements in or relating to automatic -01 semi-automatic telephone systems and in "particular is an im provem'e'n't' inor modificationof ostiinesapplication "Serial "No. 2781727'fild Jujne**12,-- 1939gnw Patent No. 2,369,071, "grantewFebiti'ary 6 1945; 'In the rearrangement described in the-Osti ine atent "referred 1'10 "above, the "designation "Of a w'alntedsubscribers'i number was'stored' inan in formation-collecting arrangement --or toll line control "circuit "for" the p'urpose "of enabling i the p'ii'iti'culais or the call .totb'e recbrde'd' 'at the enid of the conversationend was aiso storedin a conne'ctiofi controll'ing arrangement orconve'rter for thejpurpbse'ofeneiblingthe routing ofthehali to afrequiredzone' andi'tothe'wantedsubscriber-in that zone, and the 'object' of "the prese'nt invention "is "to a'v'oid" the "usefof these'corrd storagemeans. 7

According to the invention an arrangementr r collecting "information" "for"automa;ticaiiy*recordi ing sufiicient particulars of a, "call 'to 'enjahl eflthe charge to'be assessed andfinciudingwhe nailed artyts number "is taken into ruse "as'well asapparetus for controliing"the-further"settingup or; the connection to which the called partys number; is transferred'firdtfi'"'the informationcollecting "arrangement by successively operating a. vgroup or relays in "accordance with digits of the celled partys number es the o erations cor responding tothe preceding highs" ere effected: in the c'orinec'ti'otn controllingfznzrpzirzitus. I

' The inventionw'iil be better understoow from theifb1 1owing description taken in conjunction -with"theeccompanyin urawmgs which-show one embodiment thereof. In thesedrawings Figi 1 s'hows'i art ofthe tolmin'e"control-dire which isdisclosedf indetafl in Fi gsf li -40iI'I-the Ost1'ihe patenm ano part ore-modified. form-'oi the*register=transietorof-converter s own mFi' s-nim of *thisOStlin'e"ipatefihwhiie theT'e'I'naining Figs; 2- 5' show "the remainder --of the modified con verte'r; The sheets shou1dbe'arranged:as shown= in"F ig."6" t0 give-the cc 'm :v1ete--=c1moit- Figi is a"tabie showingthedigit"code which is mployeo, Fig. sis is schematic-diagram ii1ustrating'-the-*1o= cetion'cf" the toll line control circuit and the con verter in- '2: telephone system of the type "disclosed in thepreviousiy noted Gs'tiine patent.

Referiinifto 'F i g. 8 it Should be-understood that the toll iine- 'control circuit "H receives-"ffome register=transiator ['2 located "at" the originatingexchan-ee" certain information in code and this information is stored. therein. v This *iriforni-ation comprises the ceiling and J called parties num:

- -2 hers, the rateet wmcn the- 09411 is -to"b'e charged and other information which varies according to circumstances. In -addition the cal-led partys' number =-as'well as' beingstored in'the toil line control circuit H is repeated to'the 'c'onver ter13 forthe purpose-of controlling the transmission of routing digits and also digits for-effecting the selection of -the proper -grade of tr-u nk line; for determining-whether re eaters areto be included in the connection and for other purposes.

The-switch- CF shown- -Fig. 1 corresponds to thie -switch GF of-th'e t011' line control circuit-H of Fig. B aiid to the corresponding circuits-hown in the above-mentioned Ostline patent 1 and h'as access over contacts l -lii to converters 13cm; andover contacts [L -25 to printer controller's I4, etc. When the tciLl-ine control circuit l'l =is seized the switoh' CF is caused to hunt'foran idle 'conve'rter, such as the'converter lii, in the manner described in the above-mentioned'-'Ost'- line patent and -vvh'er"1: :in idle converter l 3 is found armature I01 controlled by a relay which is'not shown is closed. Ineddition a circuit-is circuiton wipr 1-06 of the switch CF, key springs I65, armature i 1 92-, wiper -3 T0 onscontact' I Winding of -re1ay' 3 t0 1 to battery. Relay 3 I ll operates andat armaturefli-closes an obvious circuit for re1aym240 which at armature'243 closes a. circuit for relay 280. over rotary ofi-normal springs-394 and also closes an obvious circuit for relay- Which is slow-to-operete. Re1ay 250 in operating at armature- 251 closes a circuit for'lighting the busy lamp 393. Re1ay3l'0- at armature 3l5 a1so closes the following circuitfor relay-230: earth, armatures 3l5,i335, winding: of re1ay230 to Just: tery. In addition relay3l0 iat armature-3w c1oses a circuit: extendingoverarmature'322 .for theupper winding'of re1a'y 320; .Relay 320-15 2, self+interru pting relay owing to its'armat-ure 322 and is employed as-an impulse generator, the condenser 323 provided in series with its lower windi'ng serving. to vary the rate v .of impulsing. Relay 320 inopereting at armature '32! close'sra. circuit from earthuat armature 3l5,'xarmatures 321,333, 345, winding' of re1eyf330 to: battery, .over the-resistance 338. Re1ay1330; however, can only operate at this time if cheer the relays: I20,jl30.,

Ml], or I50 have been operated since otherwise: it

is short-circuited from earth at armaturez3l5, armatures I52, 143,133, l23, contact"l-.associated with wiper 31501: the switch OP to'resistance 338.

The called 'partysnumber and-ithe' other information which is stored in. theitoll line-zzco'ntrol circuit is) in coded form: and each digit isrrep-t resented by the operation of one or two relays of a group of four storage relays. The converter is provided with a single group of storage relays I20, I30, I40 and,v I50 and the digit is repeated from the toll line control circuit to the converter by extension of earth over one or more of the wipers I00, IOI, I02, I03 to cause the operation of the appropriate relay in the converter. Thus if the first digit is 8this is represented by the operation of the second of the group of storage relays and hence earth will be extended over wiper IOI of the switch CF to operate relay I30 in the converter. The code employed is shown in Figure 7 where the references in the horizontal row represent the relays I20, I30, I40, I50 while the digits are represented by the figures in the vertical column. The arrangements for storing the digits in the toll line control circuit and repeating them over the wipers of the switch CF to the converter are not shown since they are similar to those described in the previously mentioned Ostline patent.

When relay I30 has operated in accordance with the digit 8 then the above-traced short-circuit for relay 330 is opened at armature I33. relay 320 has released before the short-circuit is removed, relay 330 will remain unoperated until the next operation of relay 320 when it operates over the circuit traced above. Relay 330 in operating looks over armature 345 and 334 to earth at armature 3I5 independently of relay 320.

Relay 330 at armature 33I extends earth over armature 34I, wiper 3130f the switch OP on contact I, armature I9I, contact and wiper I of the switch CF to conductor 404. This earth is effective in energising the magnet of a switch provided in the toll line control circuit which controls the successive application ofearth to the conductors extending to the storage relays so that these relays are energised successively in accordance with the digits which are to be transferred,

In addition relay 330 at armature 33I extends earth over armature 342 to the winding of the magnet 393 of the switch OP whereupon the magnet energises preparatory to stepping the wipers of the switch OP. Further, relay 330 by opening armature 335 and closing armature 333 places relay 230 under the control of relay 320, the circuit for relay 230 now extending from earth at armature 3I5, armatures 32I, and 333, winding of relay 230 to battery. Relay 230 therefore energises and releases in synchronism with relay 320 and on the first release of relay 230 a circuit is closed from earth at armature 3I4, armatures 244, 232, 26I winding of magnet 392 of the switch S to battery. Magnet 392 therefore energises preparatory to stepping the wipers of the switch S. On the next energisation of relay 320, relay 230 is again energised and the above traced circuit for the magnet 392 is opened and the wipers of the switch S are stepped on to contact 2. On the next release of relay 230 and with wiper 38'! of the switch S on contact 2 the following circuit is closed for the vertical mag net 389 of the two directional switch TDI: earth at armature 245, wiper 38! on contact 2, bank multipling, armatures 344, 352, 242, 23I in its resting position, wiper 376 on contact I, winding of vertical magnet 389 to battery. This circuit is opened and closed in synchronism with the operation of relay 320 and hence relay 230 and the wipers of the two directional switch TDI are therefore raised step by step., In addition the magnet 392 of the switch S is energised and de-energised in accordance with the operation of relay 230 over the circuit traced above and hence, for each step taken by the wipers of the switch TDI in the vertical direction so that the wipers of the switch S also make one step. Now it was assumed that the digit stored on relays I20, I30, I40 and I50 was the digit 8 and hence the wipers of the two directional switch have to be raised to the 8th level. This control is effected over wipers 383 and 384 of the switch S. These wipers in effect act as a decoding arrangement in association with armatures I22, I32, I42, I5I of the storage relays and it will be noted that contacts 3 to I2 and I5 to 24 associated with each of the wipers are connected to earth over contacts of the storage relays in such a manner that when the number of steps taken by the wipers of the switch S and consequently by the vertical magnet of the switch TDI correspond to the digit stored on the storage relays, earth is extended over both wipers 383 and 384. Since the digit 8 was stored on the storage relays, relay I30 only is operated and hence earth will be extended from armature 3I6 over armatures 343 and I32 to contact I0 associated with wiper 383; and contact I0 associated with wiper 334 is permanently earthed. Hence when wipers 303 and 384 reach contacts I0 earth will be extended over wiper 383, contact I associated with wiper 312, left hand winding of relay 350 to battery. In addition earth will be extended over Wiper'334, contact I associated with wiper 3', right hand winding of relay 350 to battery. Relay 350 is so arranged that it operates only when both its windings are energised and owing to the connections made to the contacts associated with wipers 383 and 384 the energisation of both windings only takes place when the magnet 392 of the switch S and the vertical magnet of the two directional switch have operated a number of times equivalent to the digit registered on the storage relays. Relay 350 in operating at armature 353 closes a circuit for relay 340 and at armature 352 relay 350 opens the above traced circuit for the vertical magnet 309 of the switch TDI.

In addition at armature 35I relay 350 shortcircuits armature 343 so that earth is still applied to the contacts of the storage relays I20, I30, I40 and I50. Relay 340 in operating at armature 34! removes earth from conductor 404 which earth was extended thereto on the operation of relay 330 previously described. It should be pointed out that where, as in the arrangement described in Ostline Patent No. 2,369,071, the digits representing the called partys number are stored in the toll line control circuit and the converter on groups of storage relays, the repeating of the coded indications of these digits.

from the toll line control circuit to the converter may take place continuously by the synchronous stepping of a switch in the toll line control circuit and a switch in the converter, each switch having at least four wipers and one relay of each group being connected to corresponding contacts associated with the wipers. In this case the control of the two switches is conveniently effected from the toll line control circuit. In the present arrangement, however, since only one storage group comprising the relays I20, I30, I40 and I50 is provided, these relays must remain operated until the converter has completed its operation consequent upon the repetition of a digit. Hence, the switch in the toll line control circuit which controls the operation of relays systems 5., IZ2UwISBQIMI-iandifilhn mustibeisteppedrtrom the converter; This'lis treated by earthing conductor 04 :when irrelay 330 -:operates to energize Lathe switchimagnet, whichiearthiisfremovediito'ienable thewipers': to heesteppedwhen relay-133D operates on the icompletion-oirthe operation. of the iconverterriin response to the particular :digit stored onrrelaysll2o, 130,140 and 50. When the switch is :Lstepped ont'osatheinext contact, these relays are operated in accordance-with'thefnext .digit. Atsarmaturefflzirelay 340 opens the circuit: previousiy :Ltracediforrm'agnet 1393.. of 1 theiiswitch I OP whereupon: the magnet :de-i-renergises and-wthe wipers rare isteppedaonnto:contactl2. Whenwiper 31:0 LofrthessWitCh LOP rstep's.Lzofiucontact :1 I, the original-icircuitzior" relay I I. is opened abut the relay-uis :now cheidioperated over armature 253 of rrelaycilill rand armature 192.. vAt :armature 345rre1ay'2340 -sopensithe ilockingi circuit zfortrelay 330flwliich releases. I T-Relay 330 inrreleasing re- IIlOVBSIrGIaYJQBU :fromunderthecontrol oirelay 320 sostha't' relayi1230 remainsmermanently:energised. Furtheriir'elay 33n atsarmature .331 I closes the iiollowing :selfeinterrupting circuit for the magnet 3'92Jof thefiswitch S: earth, wiper388 of the switch 5 .on lcontactslfi iarmature 331,, self-interrupting .contacts .391, winding of magneti392 tdbatt'ery. The wipers :of the switch-.S arezthus rotated to contact I3 where .the selfinterrupting circuit 1517013811811. When wipers383 and +384 1 of the :switch S are moved oii contact Illiboth "windings of relay 3505wil1 bede-energised and henceiirelay 350 releases and opens the :ienergising .:circuit of 'relayt34n. .Relay 346 howeverzremainsiheld Lover .iarmatune .344, bank 'multiplingand wipen381 toiearth Lat armature 4041now extends. as follows: :earth :at armature 33 I, armature 34 I .wiper3l3 oncontact z, armature I62, I! to conductor:404.

- lt iis 'rto be noted :that .the ;energislng circuit iorrrrelay P280 "isiopenedson the first rotary step oiiithe 'sswitch TDI at.;rotary ofi-normahsprings r 394. This relay' is howeveri maintained operated overlits lower winding-and armature 284 to earth atiarmature 336 until the termination of the rotarymovementiof therswitch TDI when relay 330 .re1ea'ses ttoropen thiszcircuit. and allow" relay 280 toirelease.v

.At thesenduof ;the-.rotary.:movem ent of the 7 switch \TDI, the-wipers of the switch OP'are stepped to Lposition v3, while .ithewipers 'of .the switch s aremreturned to position '1. The i01- lowing: circuit is now closed for the upper winding of' relay :260': earth, at -armature 245, wiper 38 l ofthe switch S'on contact 1, upper winding of- 'relay .260, contactd3 and wiper..3II of the switchiOP-nright hand winding .of relay. 350 r to battery; Relay SEEI does not operate :at this time. Relay 260 in 'operatin'g-"locks .over armatures- 262 and 343 to earth at armature-3 IIi and at armatore 26i it changes over the -i-mpuls ingixci'rcuit whichincludes armature 2 32 wotxrelay 23D from the'magn et fiaz dr the switches toa re'laymn ithe circuit nowiucluding lthe imakeebetoreebreak springs of -'armature 13.6 I -a'nd -armature 230 I -'Whenithe 'distant exchangeiis ready? to: receive the first-impulse train, .=an alternating Icurrent signallisi transmittedlibackrto theiztoll :line control circuit to cause .theimomentary operation therein of ar relay (not shown) which set :sarmature 5-1508 extends earth Lover armature :Icfll, wiper LIM of the switch LCF, Larmature i111 I fini its restzposition, upper winding sot .relay'azflcu :to :battery. Relay 2110 at armature 2l2 :closesiarlockinge'circuit for itself I over armature i252, ,imakeebefore break springs .'of.-:armature 3253 to zcarth i'armature 1251 andzat armature :213 sopens ttherzfollowing short circuit around relay 330: earth, armaturesB t5; 2"I3, ;.c'ontact 3 and wiper elfi,:resistance 338 '::'to battery. I

rzRelay 330 Willoper teaonwthenext operatiorrot relay i320 afterwthe iabove 'sshort circuit--has "been removed andin, addition-to;.performingythesoperations described above relay 5330 at armature-336 closes.a-"circuitrextending overiarmature 284vinits restlposition foryrelay I10. With relay I'Ill oper atedyand with wiper 316 ofi'the switch OP oncontact .3, the impulsingcircuit which includes-armature 23! ofrelay 230 isrextendedrioverzwiper 31B, armature:3l3 and armature III of relay I10 over wiper I04 oitheswitch CE, "armature I01 iandre- I lay I II]. in thetoll line control circuit. This impulsing circuit is employed for uth'e transmission of impulses over theiunction orrtoll line under the a control of the converter. It iSstO :be noted that direct-current impulses: are :repeated .irom the converter to rthetoll 11118200111101 circuit while at the toll 1ine1c0ntrolcircuit the-directcurrent impulses are converted into alternatingscurrent impulses,:armatures II Iandi I2 ofrelay II'I'I serving to disconnect the incomingnconductors H8 and H9 from'the toll lineconductcrsllfi and II] and -to connect the latter-over a v'ariable resistancel I3 to terminalsvl Hand. I I5 to whicha source of alternatingzcurrent having-a'vfrequency of, for instance, 50 cycles-,iswconnected.

With regard to the=impu1ses which are transmitted from thefconverter, first anumber oflnondecimal trains of impulses vare transmitted which are necessary for interworking; with networks operating on a different, principle and also for controllingthe selection of therappropriate grade of toll oritrunk lines andthetinsertion ,ofrree peaters and similar :functions. :Second the exchange designation and the inumericaluigits of ihecallediparty are transmittedwithout transla- 1011.

For the; vpurpose of. transmitting thenon-decimalztrains of impulses the. arrangement employed is similarto that describedin thepreviously mentioned Ostline' patent. Since this arrangement forms nopart :of the ,presentinvention and since it is described in detailin thewabove mentioned -Ost1ine patent it will only .be' described briefly. The contacts-in the banks associated with wipers 318 :to' 3820i theswitch TDI are arbitrarilyicross-connected toithe terminalsmarked 1 to I 20 and associated with vthe-contacts oft wipers 3B5.=and .386. Thusitthe contact err-which wiper .318 iseset "corresponds towaitrain 0fl12 impulses thatzcontact will :be crosseconnectedto terminal I2. For twowreleases oferelay. 230, armaturev23 I serves to transmit/two impulses :over wiper I04 while. armature23 2 causes: the wipers of theaswitch Site make onetstepxonly, thee-second operationcof armature 232 :causing a test circuit to vh'ev transferred :from': wiper i386 xtozz wiper 11385.; :ior

each step of the switch S a test is made for two digits. The control of this test circuit is effected by relays 200, 300 and 360 in a similar way to that described in the above mentioned Ostline patent. When the 12 impulses have been transmitted relay 340 is operated from earth at wiper 374 on contact 3, wiper 378 and cross-connection to terminal I2, contact 8 and wiper 385, armature 302 in its rest position, winding of relay 340 to battery. Relay 340 operates to stop the impulse transmission and to prepare for the transmission of the next train as previously described. If the digit to be transmitted had been odd, then the circuit for relay 340 would have extended over wiper 386, and armature 302 in its working position.

It is to be noted that when the first impulse is transmitted to relay I I0, a parallel circuit extends over armatures 27I and 22I, lower winding of relay 220 to battery. Relay 220 operates and looks over its upper winding and armature 222 in parallel with the lower winding of relay 260. In addition at armature 223 relay 220 opens the first locking circuit for relay 270 and closes a second which is also in parallel with those of relays 220 and 200. Relays 220, 260 and 270 are thus dependent on relay 340 and will therefore remain energised for the duration of the train when they will be released on the operation of relay 340. These relays are operated as described above prior to the first and sixth trains of impulses only. For subsequent impulse trains the interdigital pause is effected by the timed stepping of the switch S on its return movement. This homing circuit extends over a self-interrupting circuit which includes armature 337 up to contact I9 associated with wiper 388 with the exception that on contact I3 the circuit extends in addition over armature 20L Whenthe wiper 338 reaches contact 20, earth is extended over armature 202, 343, to the winding of relay 330. Relay 330 operates and the switch now steps to contact I under the control of relay 230.

The converters which are relatively few in number are placed in one group and may therefore be employed on a call which is to be set up over a high or low grade junction i. e. a junction having good or poor transmission characteristics. Now the first non-decimal digit transmitted from the converter controls the insertion of speech repeaters and other apparatus for modifying the speech level and since the apparatus to be inserted will depend upon the grade of junction, provision may be made for varying the first digit according to the rade of junction. Such an arrangement which is not shown comprises an additional relay, an armature of which is connected to contact 3 associated with wiper 374 of the switch OP. The back contact of this armature is connected to wiper 378 of the switch TDI while the front contact is connected to a sixth Wiper of this switch. On a call which is to be set up over a poor grade junction, the relay i not operated and the first digit which is transmitted is determined by the cross-connection extending from the appropriate contact associated with wiper 378. On a call which is to be set up over a high grade junction the relay is operated and the first digit. is determined by the cross-connection extendingfrom 'the appropriate contact associated'with' the sixth wiper of the switch TDI.

Provision is made for the transmission of five non-decimal impulse trains the switch OP taking a step at the end of each train so that at the .end-v of the transmission of the fifth train,

the wipers of the switch OP will be in position 8. It is to be noted that contacts 3 to 8 associated with wiper 373 of the switch OP aredisconnected. This wiper in association with contacts I and 2 as previously pointed out controls the operation of the switch in the toll line control circuit over which the storage relays I20, I30, I40 and I50 are operated. When the wiper 373 is stepped from contact 2, the switch in the toll line control circuit is stepped on to contact 3 to cause the operation of the storage relays in accordance with the third digit of the called party's number. This digit is retained on the storage relays until it is wanted at the end of the transmission of the non-decimal impulse trains and hence contacts 3 to 8 associated with wiper 373 are disconnected.

With Wiper 375 on contacts 8 to I3 relay 330 is short-circuited from earth at armature 3I5, armature I3i, contact 8 and wiper 375, resistance 338 to battery. With wiper 374 on contact 8, earth is extended over this wiper, armature I64, selfinterrupting contacts 407, winding of magnet 393 to battery. The wipers of the switch OP are thus stepped to position 9. When as described above a signal is received from the distant exchange indicating that the equipment thereat is ready to receive the sixth impulse train, relay 270 is again operated and at armature 274 closes the follow-. ing circuit: earth, wiper 374 on contact 9, armatures I03, 274, lower winding of relay I to battery. Relay I80 operates and looks over its upper winding and armature I82 to earth at armature 257 and at armature IBI it opens the previously traced short circuit for relay 330 and at armature I83 it closes another short-circuit for relay 330 which is dependent on the condition of the "storage relays. If one or two of the storage relays have been operated the short-circuit will be opened and relay 330 will operate to initiate the transmission of the sixth impulse train. Relay I80 is maintained operated for the remainder of the impulse transmission.

The remaining five impulse trains are transmitted under the control of wipers 303 and 384 and relay 35:3 in a manner similar to the impulsing of the vertical and rotary magnets of, the switch TDI with the exception that contacts I,I2 associated with wipers 383 and 384 only are employed due to the unoperated condition of relay 83 thereby allowing a suitable interdigital pause to be given by the time stepping of the switch S as previously described.

When the five impulse trains have been transmitted, the .wipers of the switch OP .will be at position I4 when earth is extended over wiper 37 i and armature I6I to operate relay- I90. Relay ISll looks over armature I93, at armature I9] opens the circuit to the switch magnet in the toll line control circuit and at armature I32 opens the circuit for relay 3 I 0. Relay 3 I 0 releases and at, its various armatures causes the release of all the operated relays with the exception of relay I90.

Following the release of relay 240 the following circuit is closed for restoring the two-directional switch TDI to normal: earth, wiper 380 on contact I, armature 24I, vertical off-normalsprings 395 in their operated position winding of release magnet 39I to battery. The wipers of the switch TD! are thus restored to normal and the vertical oil-normal springs 395 return to their rest position when the above traced circuit is extended over armature 3II, bank multipling and wiper 377, self-interrupting contacts 407, winding of magnet 393 to battery. The wipers of the switch 0P are thus returned to position I when earth is extended: over-wiper 314 and: armature; l'94- to short circuit relay l 90 which. thereupon. releases.

.Theeconverter canenowbeemployed: on another call I In theabove description it hasbeen assumed that five. non-decimal impulse trains were; transmitted..-This-is the maximum number but arrangements are. provided whereby a-lessnumbenof-trainsmay-be transmitted.v Assume for instance that fora particular setting of therswitch -TD:l-,,four trainsare due to be, transmitted. in.-

stead of five. A connection is in this: case made from-.theparticular contact associatedwith wiper 382 toterminal 408. Hence when wiper 314 of .the switchOP isstepped onto. contact 1-, earth is extendedover this-wiper and wiper. 382 to terminal -408,-and;thence. over the. self-interrupting con.-

tact 401, winding ofmagnet 393 to;battery.. The wipersofthe switch OP w-illthus be, steppedon to contactv 8. before thereturn tolnormal: oi. the

switch. Son. the. termination. of the previous train. As. atresulti four trainsof impulsesonly aretransmitted. It Will-.beappreciatedthat if themfirst digitreceived by the converter is sufficient. to; determine that say fourtrains only are -necessary,..the Whole level of contacts correspending to. the, first digit. received will be connectedtogether and to terminal 408. It willlalso be. appreciatedthatthree or even two trains may be suflicient in which case-suitable connections aremade, between contacts associated withwipers 381 and, 380 andterminal'wii.

Relays- 20.0 and 2H1 are provided for alarm purposesif the converter is not releasedwithina specifiedrtime. Theoperation of these relays whichis. well known is. of no importance Withre-r gard tothe present invention and. hence will not be. described further.

The circuit arrangements illustrated. in the register translator or. converter, but not described indetailtherein, for accommodating one. or two digitzone codes and for accommodating three digit special service calls, are disclosedv and claimed in the .co-pending application of. Rudolph E..Stehlik, SerialNo. 743,964, filed. April 25, 1947.

I claim:.

1-. In a telephone system, a calling.line, a called line, switching apparatus for automatically setting upa connection from said calling line to said called line, information collecting means included ,in said connection comprising a plurality of stortion of: said relay group. in accordance with: each or. the; digits stored in said storage devices: for generating a series .of. impulses corresponding to the. numerical value. of. eachv of; said stored: digits and for controlling saidautomatic switch to select said digit storage device storing the next digit ofsaid called subscriber number, a routing switch" in said. sender operated-responsive to a predetermined number of series of said generated impulses for transmitting a predetermined number of routing digits to said switching apparatus,

and means? operated, responsive: to, the remaining numberof series-10f said generated impulses for transmitting ai. corresponding: number of directing digits-toJ-said switching; apparatus, whereby said routing and said directing-digits complete the=setting- .upeof-said connection from said calling line-to said'called-line; 4

2. In 23;- telephone system, a toll line'control'cirwit, a calling; line; a. called line, means forestablishing, as connection -from;said calling line to said'tollq-line control: circuit, storage devices in saidtoll line control. circuit operatedover said connection torregister theldigits of saidcalledqine number, asender, means for associating said .toll lineecontrol. circuit with said sender, arsingledigit register: in. said: sender, means for-success sively operating said, single-digit register in. accordance withqther successive digits of said "called number registered in-=saidstorage devices means in said sender. for translating thefirst twodigits receivedrby said sing-leedigit, register into; a plurality of routing digits; means insaid sender operated inaccordance I with the remaining singledigitreceived bysaid digitregister' for transmitting-a1 correspondingnumber of switch controlling digits and means controlled by said routing digits and; said :sw-itch" controlling digits for es:- tablishing a connection from said toll line 1 con.-

trol circuitto. said called line:

to the: settingupof. a connection from said calling; linetorsaidtoll line' control circuit for associatingssaid sender-with said contro] circuit'and for storing-- in: said storage devices the digits of said called line number, means for transferring eachof thet-digits of -said called line number from said; storagadevicesto-said-group of. relays in a predetermined order, means in said sender for preventing saidtransfer means from transferring the ,next succeeding digit ofsaid'called line num:-

ber untilsaid sender has completed itsroperation's responsive tothe-"transfer' of the preceding one voitsaid digits; means insaid sender controlledresponsive-tothareeeipt of-certain number of said digits in. said; called; line? number for translating said certain, number of. digits into a predetermined, number of routing; digits, means in said sender for transmitting series of impulses correspondingerespectiyelyto eachof said routingrdigits and to: each. ofthe. remainin digits of: said called line. number-to said toll line control circuit, and meansin said toll line control circuit for repeating said series of impulses over said. toll line; thereby to complete said connection. over said toll line-to said called line;

4. In. a telephonesystema register sender in.- cluding a single-digit register and route'mechanism and a; digitasender, means for: transmitting a series of" digits: to said register sender, means for, successively operating. said single-digit register to register successive ones of said. digits, means governed in accordancewiththe; successive. operations of said single-digit register to register, anuinitiai number of saidzdigits. for selectively operating; said route, mechanismto: establish one or more routing digits, means for operating said dig-it sender to send said established routing digit or digits, and means governed in accordance with the successive operations of said single-digit register to register a subsequent number of said digits for operating said digit sender to send a subsequent number of corresponding additional digits.

5. In a telephone system, a register sender including a single-digit register and a two-motion route switch and a digit sender, means for transmitting a series of digits to said register sender, means for successively operating said single-digit register to register successive ones of said digits, means governed by the first two successive operations of said single-digit register to register the first two of said digits for selectively setting said route switch in its two motions inorder to establish one or more routing digits, means for operating said digit sender to send said established routing digit or digits, and means governed by the third, etc. successive operations of said single-digit register to register the third, etc. of said digits for operating said digit sender to send corresponding additional digits.

6. In a telephone system, a register sender including a digit register and route mechanism and a digit sender, means for transmitting a series of digits to said register sender, means for operating said digit register to register a first of said digits, means responsive to said operation of said digit register for imparting a primary setting to said route mechanism, means responsive to said primary setting of said route mechanism for releasing said digit register, means for reoperating said digit register to register a second of said digits, means responsive to said reoperation of said digit register for imparting a secondary setting to said route mechanism, means responsive to said secondary setting of said route mechanism for releasing said digit register, and means governed by said primary and secondary settings of said route mechanism for operating said digit sender to send a predetermined routing digit or digits.

7. In a telephone system, a register sender including a digit register and route mechanism and a digit sender, means for transmitting a series of digits to said register sender, means for operating said digit register to register a first of said digits, means responsive to said operation of said digit register for imparting a primary setting to said route mechanism, means responsive to said primary setting of said route mechanism for releasing said digit register, means for reoperating said digit register to register a second of said digits, means responsive to said reoperation of said digit register for imparting a secondary setting to said route mechanism, means responsive to said secondary setting of said route mechanism for releasing said digit register, means governed by said primary and secondary settings of said route mechanism for operating said digit sender to send a predetermined routing digit or digits, means for reoperating said digit register to register a third of said digits, means governed by said last-mentioned reoperation of said digit register for reoperating said digit sender to send a corresponding additional digit, and means responsive to said reoperation of said digit sender for releasing said digit register.

8. In a telephone system, a register sender register including a group of relays selectively operative in different combinations in accordance with different digit values, means for transmitting a series of digits in code to said register sender, means for successively operating said code-digit register to register successive ones of said digits, means governed in accordance with the successive operations of said code-digit register to register an initial number of said digits for selectively operating said route mechanism to establish one Or more routing digits, means for operating said digit sender to send said established routing digit or digits, and means governed in accordance wtih the successive operations of said code-digit register to register a subsequent number of said digits for operating said digit sender to send a subsequent number of corresponding additional digits.

9. In a register sender, a single-digit register successively operated responsive to the receipt of each digit of a number, means for generating a series of impulses responsive to each operation of said single-digit register, means controlled responsive to the generation of an initial number of said series of impulses for establishing a group of routing digits, means for sending said group of routing digits, and means controlled responsive to the generation of a subsequent number of said series of impulses for sending a group of directing digits.

10. In a register sender, a single-digit register successively operated to register the successive digits of a number, sender mechanism, means for operating said sender mechanism to generate an initial number of series of impulses corresponding to an initial number of operations of said single-digit register, route mechanism, means for setting said route mechanism in accordance with said initial number of said series of impulses in order to establish a group of routing digits, a toll line, means for operating said sender mechanism to send over said toll line a first group of series of impulses corresponding to said group of routing digits, means for operating said sender mechanism to generate a subsequent number of series of impulses corresponding to a subsequent number of operations of said single-digit register and constituting a group of directing digits, and means for operating said sender mechanism to send over said toll line a second group of series of impulses corresponding to said group of directing digits.

RUDOLPH FRANK S'I'EHLIK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,724,174 Bellamy et a1 Aug. 13, 1929 1,903,019 Wright Mar, 28, 1933 1,962,619 Rumpf June 12, 1934 2,180,824 Hatton Nov. 21, 1939 2,289,939 Stehlik July 14, 1942 2,339,709 Ostline Jan. 18, 1944 2,369,071 Ostline Feb. 6, 1945 2,385,228 Ostline Sept. 18, 1945 FOREIGN PATENTS Number Country Date 532,730 Great Britain Jan. 30, 1941 

